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| Channel and permanent link test configurations This section specifies requirements for field test instruments and procedures for field measurement practices that will yield repeatable measurements of installed 100 Ohm twisted-pair cabling links. The channel test configuration is to be used by system designers and users of data communications systems to verify the performance of the overall channel. The channel includes up to 90 m (295 ft) of horizontal cable, a work area equipment cord, a telecommunications outlet/connector, an optional transition/consolidation connector, and two connections in the telecommunications room. Requirements The total length of equipment cords, patch cords or jumpers and work area cords shall not exceed 10 m (33 ft). NOTE - 1 The connections to the equipment at each end of the channel are not included in the channel definition. NOTE - 2 The channel definition does not apply to those cases where the horizontal cabling is cross-connected to the backbone cabling. The permanent link test configuration is to be used by system designers and users of data communications systems to verify the performance of the permanent link. The permanent link consists of up to 90 m (295 ft) of horizontal cabling and one connection at each end and may also include an optional transition/consolidation point connection. The permanent link excludes both the cable portion of the field test instrument cord and the connection to the field test instrument. Requirements The permanent link test configuration is to be used by installers and users of data telecommunications systems to verify the performance of permanently installed cabling.
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